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Bonding in Nitroxide Spin Labels from N-14 Electric-Quadrupole Interactions

机译:N-14电-四极相互作用在氮氧化物自旋标签中的键合

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Nitrogen nuclear electric quadrupole couplings from FT-EPR of nitroxide spin labels can be used to deduce the covalent transfer pi(c) in the N-O pi-bond, and ionicities i(sigma)(NO) and i(sigma)(NC) of the N-O and N-C sigma-bonds, if they are combined with the unpaired spin density on the nitrogen rho(N)(pi) obtained from the dipolar hyperfine couplings. Application to EPR data from an analogue of the MTSSL nitroxide that is used in site-directed spin-labeling demonstrates how environmental polarity and hydrogen bonding are reflected in the bonding parameters of the C-NO-C spin label moiety. Several recent publications erroneously claim to have deduced three independent bonding parameters from nitrogen quadrupole couplings alone.
机译:来自氮氧化物自旋标记的FT-EPR的氮核四极偶合可用于推导NO pi键中的共价转移pi(c),以及离子的iσ(NO)和iσ(NC)。 NO和NCσ键,如果它们与从偶极超精细偶合获得的氮rho(N)(pi)上不成对的自旋密度结合在一起。在定点自旋标记中使用的MTSSL氮氧化物类似物应用于EPR数据,证明了环境极性和氢键如何在C-NO-C自旋标记部分的键合参数中反映出来。最近的一些出版物错误地声称仅从氮四极偶合中推导了三个独立的键合参数。

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